Identity Server Exceptions

500.30 ASP.NET Core app failed to start - System.FormatException: Could not parse the JSON file

Exception

Exception Info: System.FormatException: Could not parse the JSON file. 
---> System.Text.Json.JsonReaderException: '2' is an invalid start of a property name. Expected a '"'. LineNumber: 0 | BytePositionInLine: 1.
 at System.Text.Json.ThrowHelper.ThrowJsonReaderException(Utf8JsonReader& json, ExceptionResource resource, Byte nextByte, ReadOnlySpan`1 bytes)
 at System.Text.Json.Utf8JsonReader.ReadSingleSegment()
 at System.Text.Json.Utf8JsonReader.Read()
 at System.Text.Json.JsonDocument.Parse(ReadOnlySpan`1 utf8JsonSpan, JsonReaderOptions readerOptions, MetadataDb& database, StackRowStack& stack)
 at System.Text.Json.JsonDocument.Parse(ReadOnlyMemory`1 utf8Json, JsonReaderOptions readerOptions, Byte[] extraRentedBytes)
 at System.Text.Json.JsonDocument.Parse(ReadOnlyMemory`1 json, JsonDocumentOptions options)
 at System.Text.Json.JsonDocument.Parse(String json, JsonDocumentOptions options)
 at Microsoft.Extensions.Configuration.Json.JsonConfigurationFileParser.ParseStream(Stream input)
 at Microsoft.Extensions.Configuration.Json.JsonConfigurationFileParser.Parse(Stream input)
 at Microsoft.Extensions.Configuration.Json.JsonConfigurationProvider.Load(Stream stream) --- End of inner exception stack trace ---
 at Microsoft.Extensions.Configuration.Json.JsonConfigurationProvider.Load(Stream stream)
 at Microsoft.Extensions.Configuration.FileConfigurationProvider.Load(Boolean reload) --- End of stack trace from previous location ---
 at Microsoft.Extensions.Configuration.FileConfigurationProvider.HandleException(ExceptionDispatchInfo info)
 at Microsoft.Extensions.Configuration.FileConfigurationProvider.Load(Boolean reload)
 at Microsoft.Extensions.Configuration.FileConfigurationProvider.Load()
 at Microsoft.Extensions.Configuration.ConfigurationRoot..ctor(IList`1 providers)
 at Microsoft.Extensions.Configuration.ConfigurationBuilder.Build()
 at Microsoft.AspNetCore.Hosting.WebHostBuilder.BuildCommonServices(AggregateException& hostingStartupErrors)
 at Microsoft.AspNetCore.Hosting.WebHostBuilder.Build()
 at UiPath.IdentityServer.Web.Program.Main(String[] args)
 at UiPath.IdentityServer.Web.Program.<Main>(String[] args)

Cause

The exception is caused by a malformed appsettings.json or appsettings.Production.json file.

The exception includes the line of the configuration file that needs to be corrected, along with the offending structures. In the example above, this is:

System.Text.Json.JsonReaderException: '2' is an invalid start of a property name. Expected a '"'. LineNumber: 0 | BytePositionInLine: 1.

Solution

1. Correct the syntax of the file. You can use a JSON validator, such as JSON Online Validator and Formatter, to check for errors.

2. Restart Orchestrator in IIS.

500.30 ASP.NET Core app failed to start - certificate: 'THUMBPRINT' not found in certificate store

Exception

Exception Info: System.AggregateException: One or more errors occurred. (certificate: '0A38CB4B920B2FE107051C32EBE7BA898CCE0441' not found in certificate store)
 ---> System.InvalidOperationException: certificate: '0A38CB4B920B2FE107051C32EBE7BA898CCE0441' not found in certificate store
   at Microsoft.Extensions.DependencyInjection.IdentityServerBuilderExtensionsCrypto.AddSigningCredential(IIdentityServerBuilder builder, String name, StoreLocation location, NameType nameType, String signingAlgorithm)
   at UiPath.IdentityServer.Web.Extensions.Configuration.IdentityServerExtensions.SignWithStoreCertificate(IIdentityServerBuilder builder, SigningCredentialStores storeLocation)
   at UiPath.IdentityServer.Web.Extensions.Configuration.IdentityServerExtensions.AddSigningCredential(IIdentityServerBuilder builder, SigningCredentialSettings settings, IConfiguration configuration)
   at UiPath.IdentityServer.Web.Extensions.Configuration.IdentityServerExtensions.AddAndConfigureIdentityServer(IServiceCollection services, AppSettings appSettings, IConfiguration configuration, String dbConnection, ILogger`1 _logger, IHostEnvironment environment)
   at UiPath.IdentityServer.Web.Startup.ConfigureServicesAsync(IServiceCollection services)
   --- End of inner exception stack trace ---
   at System.Threading.Tasks.Task.ThrowIfExceptional(Boolean includeTaskCanceledExceptions)
   at System.Threading.Tasks.Task.Wait(Int32 millisecondsTimeout, CancellationToken cancellationToken)
   at System.Threading.Tasks.Task.Wait()
   at UiPath.IdentityServer.Web.Startup.ConfigureServices(IServiceCollection services)
   at System.RuntimeMethodHandle.InvokeMethod(Object target, Object[] arguments, Signature sig, Boolean constructor, Boolean wrapExceptions)
   at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)
   at Microsoft.AspNetCore.Hosting.MethodInfoExtensions.InvokeWithoutWrappingExceptions(MethodInfo methodInfo, Object obj, Object[] parameters)
   at Microsoft.AspNetCore.Hosting.ConfigureServicesBuilder.InvokeCore(Object instance, IServiceCollection services)
   at Microsoft.AspNetCore.Hosting.ConfigureServicesBuilder.<>c__DisplayClass9_0.<Invoke>g__Startup|0(IServiceCollection serviceCollection)
   at Microsoft.AspNetCore.Hosting.ConfigureServicesBuilder.Invoke(Object instance, IServiceCollection services)
   at Microsoft.AspNetCore.Hosting.ConfigureServicesBuilder.<>c__DisplayClass8_0.<Build>b__0(IServiceCollection services)
   at Microsoft.AspNetCore.Hosting.StartupLoader.ConfigureServicesDelegateBuilder`1.<>c__DisplayClass14_0.<ConfigureServices>g__ConfigureServicesWithContainerConfiguration|0(IServiceCollection services)
   at Microsoft.AspNetCore.Hosting.ConventionBasedStartup.ConfigureServices(IServiceCollection services)
   at Microsoft.AspNetCore.Hosting.WebHost.EnsureApplicationServices()
   at Microsoft.AspNetCore.Hosting.WebHost.Initialize()
   at Microsoft.AspNetCore.Hosting.WebHostBuilder.Build()
   at UiPath.IdentityServer.Web.Program.Main(String[] args)
   at UiPath.IdentityServer.Web.Program.<Main>(String[] args)

Cause

The certificate cannot be found in the store declared in the appsettings.Production.json file, or the application pool cannot access the private key of the certificate.

Important:

Make sure to not insert invisible characters when copying the thumbprint from the Windows certificate viewer.

Solution

1. Make sure that the certificate is included in the certificate store within the appsettings.Production.json file.

In this example, the applications looks for the certificate with the 0A38CB4B920B2FE107051C32EBE7BA898CCE0441 thumbprint at the LocalMachine location.

"SigningCredentialSettings": {
      "StoreLocation": {
        "Name": "0A38CB4B920B2FE107051C32EBE7BA898CCE0441",
        "Location": "LocalMachine",
        "NameType": "Thumbprint"
      }

For details, see the Private key certificates page.

2. Make sure that the user under which the application pool is running has access rights for the private key.

3. Restart Orchestrator in IIS.

Additionally, check out the Changing Certificates After Installation section for details.

500.30 ASP.NET Core app failed to start - Internal.Cryptography.CryptoThrowHelper+WindowsCryptographicException: The parameter is incorrect

Exception

Exception Info: System.AggregateException: One or more errors occurred. (The parameter is incorrect.)
 ---> Internal.Cryptography.CryptoThrowHelper+WindowsCryptographicException: The parameter is incorrect.
   at System.Security.Cryptography.RSACng.EncryptOrDecrypt(SafeNCryptKeyHandle key, ReadOnlySpan`1 input, AsymmetricPaddingMode paddingMode, Void* paddingInfo, Boolean encrypt)
   at System.Security.Cryptography.RSACng.EncryptOrDecrypt(Byte[] data, RSAEncryptionPadding padding, Boolean encrypt)
   at System.Security.Cryptography.RSACng.Decrypt(Byte[] data, RSAEncryptionPadding padding)
   at UiPath.IdentityServer.Web.Extensions.Utils.ConfigCryptoProvider.DecryptKey(String encryptedString)
   at UiPath.IdentityServer.Web.Extensions.Configuration.AppSettingsConfigInitializer.LoadEncryptedAppSettings(IHostEnvironment env, IConfiguration configuration, AppSettings settings, ConnectionStrings& dbConnection, ILogger logger)
   at UiPath.IdentityServer.Web.Startup.ConfigureServicesAsync(IServiceCollection services)
   --- End of inner exception stack trace ---
   at System.Threading.Tasks.Task.ThrowIfExceptional(Boolean includeTaskCanceledExceptions)
   at System.Threading.Tasks.Task.Wait(Int32 millisecondsTimeout, CancellationToken cancellationToken)
   at System.Threading.Tasks.Task.Wait()
   at UiPath.IdentityServer.Web.Startup.ConfigureServices(IServiceCollection services)
   at System.RuntimeMethodHandle.InvokeMethod(Object target, Object[] arguments, Signature sig, Boolean constructor, Boolean wrapExceptions)
   at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)
   at Microsoft.AspNetCore.Hosting.MethodInfoExtensions.InvokeWithoutWrappingExceptions(MethodInfo methodInfo, Object obj, Object[] parameters)
   at Microsoft.AspNetCore.Hosting.ConfigureServicesBuilder.InvokeCore(Object instance, IServiceCollection services)
   at Microsoft.AspNetCore.Hosting.ConfigureServicesBuilder.<>c__DisplayClass9_0.<Invoke>g__Startup|0(IServiceCollection serviceCollection)
   at Microsoft.AspNetCore.Hosting.ConfigureServicesBuilder.Invoke(Object instance, IServiceCollection services)
   at Microsoft.AspNetCore.Hosting.ConfigureServicesBuilder.<>c__DisplayClass8_0.<Build>b__0(IServiceCollection services)
   at Microsoft.AspNetCore.Hosting.StartupLoader.ConfigureServicesDelegateBuilder`1.<>c__DisplayClass14_0.<ConfigureServices>g__ConfigureServicesWithContainerConfiguration|0(IServiceCollection services)
   at Microsoft.AspNetCore.Hosting.ConventionBasedStartup.ConfigureServices(IServiceCollection services)
   at Microsoft.AspNetCore.Hosting.WebHost.EnsureApplicationServices()
   at Microsoft.AspNetCore.Hosting.WebHost.Initialize()
   at Microsoft.AspNetCore.Hosting.WebHostBuilder.Build()
   at UiPath.IdentityServer.Web.Program.Main(String[] args)
   at UiPath.IdentityServer.Web.Program.<Main>(String[] args)

Cause

The appsettings.Production.json file was modified without decryption.

Solution

1. Decrypt the appsettings.Production.json file using the command in the Decryption section of the Encrypting AppSettings.Production.json page.

2. Update theappsettings.Production.json file.

3. Encrypt the appsettings.Production.json file.

500.30 ASP.NET Core app failed to start - System.NullReferenceException: Object reference not set to an instance of an object at UiPath.IdentityServer.Web.Extensions.Configuration.IdentityServerExtensions.AddSigningCredential

Exception

Exception Info: System.AggregateException: One or more errors occurred. (Object reference not set to an instance of an object.) ---> System.NullReferenceException: Object reference not set to an instance of an object.
 at UiPath.IdentityServer.Web.Extensions.Configuration.IdentityServerExtensions.AddSigningCredential(IIdentityServerBuilder builder, SigningCredentialSettings settings, IConfiguration configuration)
 at UiPath.IdentityServer.Web.Extensions.Configuration.IdentityServerExtensions.AddAndConfigureIdentityServer(IServiceCollection services, AppSettings appSettings, IConfiguration configuration, String dbConnection, ILogger`1 _logger, IHostEnvironment environment)
 at UiPath.IdentityServer.Web.Startup.ConfigureServicesAsync(IServiceCollection services) --- End of inner exception stack trace ---
 at System.Threading.Tasks.Task.ThrowIfExceptional(Boolean includeTaskCanceledExceptions)
 at System.Threading.Tasks.Task.Wait(Int32 millisecondsTimeout, CancellationToken cancellationToken)
 at System.Threading.Tasks.Task.Wait()
 at UiPath.IdentityServer.Web.Startup.ConfigureServices(IServiceCollection services)
 at System.RuntimeMethodHandle.InvokeMethod(Object target, Object[] arguments, Signature sig, Boolean constructor, Boolean wrapExceptions)
 at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)
 at Microsoft.AspNetCore.Hosting.MethodInfoExtensions.InvokeWithoutWrappingExceptions(MethodInfo methodInfo, Object obj, Object[] parameters)
 at Microsoft.AspNetCore.Hosting.ConfigureServicesBuilder.InvokeCore(Object instance, IServiceCollection services)
 at Microsoft.AspNetCore.Hosting.ConfigureServicesBuilder.<>c__DisplayClass9_0.<Invoke>g__Startup|0(IServiceCollection serviceCollection)
 at Microsoft.AspNetCore.Hosting.ConfigureServicesBuilder.Invoke(Object instance, IServiceCollection services)
 at Microsoft.AspNetCore.Hosting.ConfigureServicesBuilder.<>c__DisplayClass8_0.<Build>b__0(IServiceCollection services)
 at Microsoft.AspNetCore.Hosting.StartupLoader.ConfigureServicesDelegateBuilder`1.<>c__DisplayClass14_0.<ConfigureServices>g__ConfigureServicesWithContainerConfiguration|0(IServiceCollection services)
 at Microsoft.AspNetCore.Hosting.ConventionBasedStartup.ConfigureServices(IServiceCollection services)
 at Microsoft.AspNetCore.Hosting.WebHost.EnsureApplicationServices()
 at Microsoft.AspNetCore.Hosting.WebHost.Initialize()
 at Microsoft.AspNetCore.Hosting.WebHostBuilder.Build()
 at UiPath.IdentityServer.Web.Program.Main(String[] args)
 at UiPath.IdentityServer.Web.Program.<Main>(String[] args)

Cause

The SigningCredentialSettings property is not configured in appsettings.Production.json or in the Azure App Service settings.

OR

An ASPNET_ENVIRONMENT environment variable is set to something other than Production, which prevents the settings from being read from appsettings.Production.json.

Solution

For Windows Server

Make sure that the appsettings.Production.json file contains the SigningCredentialSettings section. Example:

"AppSettings": {
    [...]
    "SigningCredentialSettings": {
      "StoreLocation": {
        "Name": "0A38CB4B920B2FE107051C32EBE7BA898CCE0446",
        "Location": "LocalMachine",
        "NameType": "Thumbprint"
      }
    }

For Azure App Service

Make sure that the settings outlined at step 5 of the Publish to Identity Server page are configured correctly.

500.30 ASP.NET Core app failed to start - Microsoft.Data.SqlClient.SqlException (0x80131904): Login failed for user 'USERNAME'

Exception

Exception Info: System.AggregateException: One or more errors occurred. (Login failed for user 'USERNAME'.) ---> Microsoft.Data.SqlClient.SqlException (0x80131904): Login failed for user 'USERNAME'.
 at Microsoft.Data.SqlClient.SqlInternalConnection.OnError(SqlException exception, Boolean breakConnection, Action`1 wrapCloseInAction)
 at Microsoft.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObject stateObj, Boolean callerHasConnectionLock, Boolean asyncClose)
 at Microsoft.Data.SqlClient.TdsParser.TryRun(RunBehavior runBehavior, SqlCommand cmdHandler, SqlDataReader dataStream, BulkCopySimpleResultSet bulkCopyHandler, TdsParserStateObject stateObj, Boolean& dataReady)
 at Microsoft.Data.SqlClient.TdsParser.Run(RunBehavior runBehavior, SqlCommand cmdHandler, SqlDataReader dataStream, BulkCopySimpleResultSet bulkCopyHandler, TdsParserStateObject stateObj)
 at Microsoft.Data.SqlClient.SqlInternalConnectionTds.CompleteLogin(Boolean enlistOK)
 at Microsoft.Data.SqlClient.SqlInternalConnectionTds.AttemptOneLogin(ServerInfo serverInfo, String newPassword, SecureString newSecurePassword, Boolean ignoreSniOpenTimeout, TimeoutTimer timeout, Boolean withFailover)
 at Microsoft.Data.SqlClient.SqlInternalConnectionTds.LoginNoFailover(ServerInfo serverInfo, String newPassword, SecureString newSecurePassword, Boolean redirectedUserInstance, SqlConnectionString connectionOptions, SqlCredential credential, TimeoutTimer timeout)
 at Microsoft.Data.SqlClient.SqlInternalConnectionTds.OpenLoginEnlist(TimeoutTimer timeout, SqlConnectionString connectionOptions, SqlCredential credential, String newPassword, SecureString newSecurePassword, Boolean redirectedUserInstance)
 at Microsoft.Data.SqlClient.SqlInternalConnectionTds..ctor(DbConnectionPoolIdentity identity, SqlConnectionString connectionOptions, SqlCredential credential, Object providerInfo, String newPassword, SecureString newSecurePassword, Boolean redirectedUserInstance, SqlConnectionString userConnectionOptions, SessionData reconnectSessionData, Boolean applyTransientFaultHandling, String accessToken, DbConnectionPool pool)
 at Microsoft.Data.SqlClient.SqlConnectionFactory.CreateConnection(DbConnectionOptions options, DbConnectionPoolKey poolKey, Object poolGroupProviderInfo, DbConnectionPool pool, DbConnection owningConnection, DbConnectionOptions userOptions)
 at Microsoft.Data.ProviderBase.DbConnectionFactory.CreatePooledConnection(DbConnectionPool pool, DbConnection owningObject, DbConnectionOptions options, DbConnectionPoolKey poolKey, DbConnectionOptions userOptions)
 at Microsoft.Data.ProviderBase.DbConnectionPool.CreateObject(DbConnection owningObject, DbConnectionOptions userOptions, DbConnectionInternal oldConnection)
 at Microsoft.Data.ProviderBase.DbConnectionPool.UserCreateRequest(DbConnection owningObject, DbConnectionOptions userOptions, DbConnectionInternal oldConnection)
 at Microsoft.Data.ProviderBase.DbConnectionPool.TryGetConnection(DbConnection owningObject, UInt32 waitForMultipleObjectsTimeout, Boolean allowCreate, Boolean onlyOneCheckConnection, DbConnectionOptions userOptions, DbConnectionInternal& connection)
 at Microsoft.Data.ProviderBase.DbConnectionPool.TryGetConnection(DbConnection owningObject, TaskCompletionSource`1 retry, DbConnectionOptions userOptions, DbConnectionInternal& connection)
 at Microsoft.Data.ProviderBase.DbConnectionFactory.TryGetConnection(DbConnection owningConnection, TaskCompletionSource`1 retry, DbConnectionOptions userOptions, DbConnectionInternal oldConnection, DbConnectionInternal& connection)
 at Microsoft.Data.ProviderBase.DbConnectionInternal.TryOpenConnectionInternal(DbConnection outerConnection, DbConnectionFactory connectionFactory, TaskCompletionSource`1 retry, DbConnectionOptions userOptions)
 at Microsoft.Data.ProviderBase.DbConnectionClosed.TryOpenConnection(DbConnection outerConnection, DbConnectionFactory connectionFactory, TaskCompletionSource`1 retry, DbConnectionOptions userOptions)
 at Microsoft.Data.SqlClient.SqlConnection.TryOpen(TaskCompletionSource`1 retry, SqlConnectionOverrides overrides)
 at Microsoft.Data.SqlClient.SqlConnection.Open(SqlConnectionOverrides overrides)
 at Microsoft.Data.SqlClient.SqlConnection.Open()
 at UiPath.IdentityServer.Infrastructure.Data.SqlDatabaseFeatures.GetSqlServerEdition()
 at UiPath.IdentityServer.Infrastructure.Data.SqlDatabaseFeatures.OnlineIndexOperationsSupported(String edition)
 at UiPath.IdentityServer.Infrastructure.Data.ApplicationContext.SetDatabaseFeatures(Boolean onlineIndexOperationsEnabled, String connectionName, String connectionString)
 at UiPath.IdentityServer.Infrastructure.Data.ApplicationContext.SetSwitches(Boolean onlineIndexOperationsEnabled, String connectionName, String connectionStrings)
 at UiPath.IdentityServer.Web.Startup.ConfigureServicesAsync(IServiceCollection services) ClientConnectionId:5ae3b113-df69-484f-a02e-03d7fc6b8889 Error Number:18456,State:1,Class:14 --- End of inner exception stack trace ---
 at System.Threading.Tasks.Task.ThrowIfExceptional(Boolean includeTaskCanceledExceptions)
 at System.Threading.Tasks.Task.Wait(Int32 millisecondsTimeout, CancellationToken cancellationToken)
 at System.Threading.Tasks.Task.Wait()
 at UiPath.IdentityServer.Web.Startup.ConfigureServices(IServiceCollection services)
 at System.RuntimeMethodHandle.InvokeMethod(Object target, Object[] arguments, Signature sig, Boolean constructor, Boolean wrapExceptions)
 at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)
 at Microsoft.AspNetCore.Hosting.MethodInfoExtensions.InvokeWithoutWrappingExceptions(MethodInfo methodInfo, Object obj, Object[] parameters)
 at Microsoft.AspNetCore.Hosting.ConfigureServicesBuilder.InvokeCore(Object instance, IServiceCollection services)
 at Microsoft.AspNetCore.Hosting.ConfigureServicesBuilder.<>c__DisplayClass9_0.<Invoke>g__Startup|0(IServiceCollection serviceCollection)
 at Microsoft.AspNetCore.Hosting.ConfigureServicesBuilder.Invoke(Object instance, IServiceCollection services)
 at Microsoft.AspNetCore.Hosting.ConfigureServicesBuilder.<>c__DisplayClass8_0.<Build>b__0(IServiceCollection services)
 at Microsoft.AspNetCore.Hosting.StartupLoader.ConfigureServicesDelegateBuilder`1.<>c__DisplayClass14_0.<ConfigureServices>g__ConfigureServicesWithContainerConfiguration|0(IServiceCollection services)
 at Microsoft.AspNetCore.Hosting.ConventionBasedStartup.ConfigureServices(IServiceCollection services)
 at Microsoft.AspNetCore.Hosting.WebHost.EnsureApplicationServices()
 at Microsoft.AspNetCore.Hosting.WebHost.Initialize()
 at Microsoft.AspNetCore.Hosting.WebHostBuilder.Build()
 at UiPath.IdentityServer.Web.Program.Main(String[] args)
 at UiPath.IdentityServer.Web.Program.<Main>(String[] args)

Cause

The configuration string of the appsettings.Production.json file contains a wrong password.

Solution

1. Correct the connection string password in the appsettings.Production.json file.

2. Restart Orchestrator in IIS.

500.30 ASP.NET Core app failed to start - System.InvalidOperationException: Signing credentails settings is invalid

Exception

Exception Info: System.AggregateException: One or more errors occurred. (Signing credentails settings is invalid.)
 ---> System.InvalidOperationException: Signing credentails settings is invalid.
   at UiPath.IdentityServer.Web.Extensions.Configuration.IdentityServerExtensions.AddSigningCredential(IIdentityServerBuilder builder, SigningCredentialSettings settings, IConfiguration configuration)
   at UiPath.IdentityServer.Web.Extensions.Configuration.IdentityServerExtensions.AddAndConfigureIdentityServer(IServiceCollection services, AppSettings appSettings, IConfiguration configuration)
   at UiPath.IdentityServer.Web.Startup.ConfigureServicesAsync(IServiceCollection services)
   --- End of inner exception stack trace ---
   at System.Threading.Tasks.Task.ThrowIfExceptional(Boolean includeTaskCanceledExceptions)
   at System.Threading.Tasks.Task.Wait(Int32 millisecondsTimeout, CancellationToken cancellationToken)
   at System.Threading.Tasks.Task.Wait()
   at UiPath.IdentityServer.Web.Startup.ConfigureServices(IServiceCollection services)
   at System.RuntimeMethodHandle.InvokeMethod(Object target, Object[] arguments, Signature sig, Boolean constructor, Boolean wrapExceptions)
   at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)
   at Microsoft.AspNetCore.Hosting.MethodInfoExtensions.InvokeWithoutWrappingExceptions(MethodInfo methodInfo, Object obj, Object[] parameters)
   at Microsoft.AspNetCore.Hosting.ConfigureServicesBuilder.InvokeCore(Object instance, IServiceCollection services)
   at Microsoft.AspNetCore.Hosting.ConfigureServicesBuilder.<>c__DisplayClass9_0.<Invoke>g__Startup|0(IServiceCollection serviceCollection)
   at Microsoft.AspNetCore.Hosting.ConfigureServicesBuilder.Invoke(Object instance, IServiceCollection services)
   at Microsoft.AspNetCore.Hosting.ConfigureServicesBuilder.<>c__DisplayClass8_0.<Build>b__0(IServiceCollection services)
   at Microsoft.AspNetCore.Hosting.StartupLoader.ConfigureServicesDelegateBuilder`1.<>c__DisplayClass14_0.<ConfigureServices>g__ConfigureServicesWithContainerConfiguration|0(IServiceCollection services)
   at Microsoft.AspNetCore.Hosting.ConventionBasedStartup.ConfigureServices(IServiceCollection services)
   at Microsoft.AspNetCore.Hosting.WebHost.EnsureApplicationServices()
   at Microsoft.AspNetCore.Hosting.WebHost.Initialize()
   at Microsoft.AspNetCore.Hosting.WebHostBuilder.Build()
   at UiPath.IdentityServer.Web.Program.Main(String[] args)
   at UiPath.IdentityServer.Web.Program.<Main>(String[] args)

Cause

The SigningCredentialSettings property is not configured in appsettings.Production.json.

OR

An ASPNET_ENVIRONMENT environment variable is set to something other than Production, which prevents the settings from being read from appsettings.Production.json.

Solution

1. Make sure that the appsettings.Production.json file contains the SigningCredentialSettings section. Example:

"AppSettings": {
    [...]
    "SigningCredentialSettings": {
      "StoreLocation": {
        "Name": "0A38CB4B920B2FE107051C32EBE7BA898CCE0446",
        "Location": "LocalMachine",
        "NameType": "Thumbprint"
      }
    }

2. Run the following command from an elevated command line interface:

setx ASPNETCORE_ENVIRONMENT Production

3. Restart Orchestrator in IIS.

500.30 ASP.NET Core app failed to start - System.IO.FileNotFoundException: Could not load file or assembly 'System.Threading.Tasks'

Exception

Exception Info: System.IO.FileNotFoundException: Could not load file or assembly 'System.Threading.Tasks, Version=4.0.10.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a'. The system cannot find the file specified.
File name: 'System.Threading.Tasks, Version=4.0.10.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a'
   at Dynatrace.OneAgent.Introspection.TaskEventHandler.NotifyCreated(Object taskObject, Object stateObject)
   at System.Threading.Tasks.Task`1..ctor()
   at System.Runtime.CompilerServices.AsyncTaskMethodBuilder`1.InitializeTaskAsPromise()
   at System.Runtime.CompilerServices.AsyncTaskMethodBuilder`1.SetException(Exception exception)
   at System.Runtime.CompilerServices.AsyncTaskMethodBuilder.SetException(Exception exception)
   at UiPath.IdentityServer.Web.Program.Main(String[] args)
   at System.Runtime.CompilerServices.AsyncMethodBuilderCore.Start[TStateMachine](TStateMachine& stateMachine)
   at UiPath.IdentityServer.Web.Program.Main(String[] args)
   at UiPath.IdentityServer.Web.Program.<Main>(String[] args)

Cause

The issue is caused by the Dynatrace agent responsible for Application Performance Monitoring (APM).

Solution

Upgrade to the latest standalone version or to the minimum version in support. See the Product lifecycle page for details.

OR

Disable AppInsights, Dynatrace, NewRelic, DataDog.

500.30 ASP.NET Core app failed to start - System.TypeInitializationException: The system cannot find the file specified. File name: 'System.Runtime'

Exception

Application: w3wp.exe CoreCLR Version: 5.0.1221.52207 .NET Version: 5.0.12 
Description: The process was terminated due to an unhandled exception. 
Exception Info: System.TypeInitializationException: The type initializer for '<Module>' threw an exception. 
---> System.IO.FileNotFoundException: Could not load file or assembly 'System.Runtime, Version=4.1.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a'. 
The system cannot find the file specified. File name: 'System.Runtime, Version=4.1.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' at .cctor() --- End of inner exception stack trace ---</

Cause

The issue is caused by the Dynatrace OneAgent for Application Performance Monitoring (APM).

Solution

Upgrade to the latest standalone version or to the minimum version in support. See the Product lifecycle page for details.

OR

Disable AppInsights, Dynatrace, NewRelic, DataDog.

500.30 ASP.NET Core app failed to start - FileNotFoundException*Could not load file or assembly 'System.Text.Encoding'

Exception

2022-03-24 14:55:22.7046 Microsoft.AspNetCore.Server.IIS.Core.IISHttpServer Connection ID "17582052951159996422", Request ID "80000007-0001-f400-b63f-84710c7967bb": An unhandled exception was thrown by the application. FileNotFoundException*Could not load file or assembly 'System.Text.Encoding, Version=4.0.10.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a'. The system cannot find the file specified.*
 at  Dynatrace.OneAgent.Introspection.NewAspNetCoreTracingMiddleware.CreateIHttpContext(HttpContext context)
 at  Dynatrace.OneAgent.Introspection.Shared.NewAspNetCoreTracingMiddlewareBase`1.Invoke(Context context)
 at  Microsoft.AspNetCore.Server.IIS.Core.IISHttpContextOfT`1.ProcessRequestAsync()

Cause

The issue is caused by the Dynatrace agent responsible for Application Performance Monitoring (APM).

Solution

Upgrade to the latest standalone version or to the minimum version in support. See the Product lifecycle page for details.

OR

Disable AppInsights, Dynatrace, NewRelic, DataDog.

500.30 ASP.NET Core app failed to start - SqlException (0x80131904): Connection Timeout Expired. The timeout period elapsed while attempting to consume the pre-login handshake acknowledgement

Exception

Application: w3wp.exe CoreCLR Version: 6.0.922.41905 .NET Version: 6.0.9 Description: The process was terminated due to an unhandled exception. Exception Info: System.Data.Entity.Core.EntityException: The underlying provider failed on Open. ---> Microsoft.Data.SqlClient.SqlException (0x80131904): Connection Timeout Expired. The timeout period elapsed while attempting to consume the pre-login handshake acknowledgement. This could be because the pre-login handshake failed or the server was unable to respond back in time. The duration spent while attempting to connect to this server was - [Pre-Login] initialization=21041; handshake=0; ---> System.ComponentModel.Win32Exception (258): The wait operation timed out. at bool Microsoft.Data.ProviderBase.DbConnectionPool.TryGetConnection(DbConnection owningObject, uint waitForMultipleObjectsTimeout, bool allowCreate, bool onlyOneCheckConnection, DbConnectionOptions userOptions, out DbConnectionInternal connection) at void Microsoft.Data.ProviderBase.DbConnectionPool.WaitForPendingOpen() at void System.Data.Entity.SqlServer.DefaultSqlExecutionStrategy+<>c__DisplayClass4_0+<<ExecuteAsync>b__0>d.MoveNext() in /_/src/ErikEJ.EntityFramework.SqlServer/DefaultSqlExecutionStrategy.cs:line 67 at async Task<TResult> System.Data.Entity.SqlServer.DefaultSqlExecutionStrategy.ExecuteAsyncImplementation<TResult>(Func<Task<TResult>> func) in /_/src/ErikEJ.EntityFramework.SqlServer/DefaultSqlExecutionStrategy.cs:line 85
 at void System.Data.Entity.Utilities.TaskExtensions+CultureAwaiter.GetResult()
 at async Task System.Data.Entity.Core.EntityClient.EntityConnection.OpenAsync(CancellationToken cancellationToken) ClientConnectionId:7adb755f-b116-4a08-8835-589603d1e3e6 Error Number:-2,State:0,Class:11 --- End of inner exception stack trace ---
 at System.Data.Entity.Core.EntityClient.EntityConnection.OpenAsync(CancellationToken cancellationToken)
 at System.Data.Entity.Utilities.TaskExtensions.CultureAwaiter.GetResult()
 at System.Data.Entity.Core.Objects.ObjectContext.EnsureConnectionAsync(Boolean shouldMonitorTransactions, CancellationToken cancellationToken)
 at System.Data.Entity.Utilities.TaskExtensions.CultureAwaiter.GetResult()
 at System.Data.Entity.Core.Objects.ObjectContext.ExecuteInTransactionAsync[T](Func`1 func, IDbExecutionStrategy executionStrategy, Boolean startLocalTransaction, Boolean releaseConnectionOnSuccess, CancellationToken cancellationToken)
 at System.Data.Entity.SqlServer.DefaultSqlExecutionStrategy.ExecuteAsyncImplementation[TResult](Func`1 func) in /_/src/ErikEJ.EntityFramework.SqlServer/DefaultSqlExecutionStrategy.cs:line 85
 at System.Data.Entity.Utilities.TaskExtensions.CultureAwaiter`1.GetResult()
 at System.Data.Entity.Core.Objects.ObjectContext.ExecuteStoreQueryReliablyAsync[TElement](String commandText, String entitySetName, ExecutionOptions executionOptions, CancellationToken cancellationToken, IDbExecutionStrategy executionStrategy, Object[] parameters)
 at System.Data.Entity.Utilities.TaskExtensions.CultureAwaiter`1.GetResult()
 at System.Data.Entity.Internal.LazyAsyncEnumerator`1.FirstMoveNextAsync(CancellationToken cancellationToken)
 at System.Data.Entity.Utilities.TaskExtensions.CultureAwaiter`1.GetResult()
 at System.Data.Entity.Infrastructure.IDbAsyncEnumerableExtensions.SingleAsync[TSource](IDbAsyncEnumerable`1 source, CancellationToken cancellationToken)
 at UiPath.Orchestrator.DataAccess.Common.Abstractions.BaseDatabaseCommands`1.LockTransactionAsync(String resource, Nullable`1 lockTimeout)
 at UiPath.Orchestrator.UpdateServer.Domain.Managers.SystemSchedulesManager.AddOrUpdateScheduleAsync[THandler,TArgs](String name, String cronExpression)
 at UiPath.Orchestrator.UpdateServer.Domain.Managers.SystemSchedulesManager.InitializeSystemSchedulesAsync()
 at Nito.AsyncEx.Synchronous.TaskExtensions.WaitAndUnwrapException(Task task)
 at Nito.AsyncEx.AsyncContext.<>c__DisplayClass15_0.<Run>b__0(Task t)
 at System.Threading.Tasks.ContinuationTaskFromTask.InnerInvoke()
 at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state) --- End of stack trace from previous location ---
 at System.Threading.Tasks.Task.ExecuteWithThreadLocal(Task& currentTaskSlot, Thread threadPoolThread) --- End of stack trace from previous location ---
 at Nito.AsyncEx.Synchronous.TaskExtensions.WaitAndUnwrapException(Task task)
 at Nito.AsyncEx.AsyncContext.Run(Func`1 action)
 at Abp.Threading.AsyncHelper.RunSync(Func`1 action)
 at UiPath.Orchestrator.UpdateServer.UpdateServerModule.PostInitialize()
 at Abp.Modules.AbpModuleManager.<>c.<StartModules>b__15_2(AbpModuleInfo module)
 at System.Collections.Generic.List`1.ForEach(Action`1 action)
 at Abp.Modules.AbpModuleManager.StartModules()
 at Abp.AbpBootstrapper.Initialize()
 at Abp.AspNetCore.AbpApplicationBuilderExtensions.InitializeAbp(IApplicationBuilder app)
 at Abp.AspNetCore.AbpApplicationBuilderExtensions.UseAbp(IApplicationBuilder app)
 at UiPath.Orchestrator.Startup.Startup.Configure(IApplicationBuilder app, IApiVersionDescriptionProvider apiVersionProvider, VersionedODataModelBuilder modelBuilder, IServiceProvider serviceProvider)
 at System.RuntimeMethodHandle.InvokeMethod(Object target, Span`1& arguments, Signature sig, Boolean constructor, Boolean wrapExceptions)
 at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)
 at Microsoft.AspNetCore.Hosting.ConfigureBuilder.Invoke(Object instance, IApplicationBuilder builder)
 at Microsoft.AspNetCore.Hosting.ConfigureBuilder.<>c__DisplayClass4_0.<Build>b__0(IApplicationBuilder builder)
 at Microsoft.AspNetCore.Hosting.ConventionBasedStartup.Configure(IApplicationBuilder app)
 at Microsoft.Extensions.DependencyInjection.AutoRegisterMiddleware.<>c__DisplayClass4_0.<Configure>b__0(IApplicationBuilder app)
 at Microsoft.AspNetCore.Mvc.Filters.MiddlewareFilterBuilderStartupFilter.<>c__DisplayClass0_0.<Configure>g__MiddlewareFilterBuilder|0(IApplicationBuilder builder)
 at Microsoft.ApplicationInsights.AspNetCore.ApplicationInsightsStartupFilter.<>c__DisplayClass2_0.<Configure>b__0(IApplicationBuilder app)
 at Microsoft.AspNetCore.Server.IIS.Core.IISServerSetupFilter.<>c__DisplayClass2_0.<Configure>b__0(IApplicationBuilder app)
 at Microsoft.AspNetCore.Server.IIS.Core.IISServerSetupFilter.<>c__DisplayClass2_0.<Configure>b__0(IApplicationBuilder app)
 at Microsoft.AspNetCore.HostFilteringStartupFilter.<>c__DisplayClass0_0.<Configure>b__0(IApplicationBuilder app)
 at Microsoft.AspNetCore.Hosting.WebHost.BuildApplication()
 at Microsoft.AspNetCore.Hosting.WebHost.StartAsync(CancellationToken cancellationToken)
 at Microsoft.AspNetCore.Hosting.WebHostExtensions.RunAsync(IWebHost host, CancellationToken token, String startupMessage)
 at Microsoft.AspNetCore.Hosting.WebHostExtensions.RunAsync(IWebHost host, CancellationToken token, String startupMessage)
 at Microsoft.AspNetCore.Hosting.WebHostExtensions.RunAsync(IWebHost host, CancellationToken token)
 at UiPath.Orchestrator.Startup.Program.Main(String[] args)
 at UiPath.Orchestrator.Startup.Program.<Main>(String[] args)

Cause

The Update Server connection string does not have the MultiSubnetFailover parameter set to true.

Solution

1. Correct all connection strings such that their MultiSubnetFailover parameter is set to true.

2. Restart Orchestrator in IIS.

500.30 ASP.NET Core app failed to start - Managed server didn't initialize after X ms

Exception

Application '/LM/W3SVC/1/ROOT' with physical root 'C:\Program Files (x86)\UiPath\APPLICATIONNAME\' failed to load coreclr. Exception message:
Managed server didn't initialize after X ms.

Cause

The startup time limit might be restrictive and cause downtime in environments affected by high CPU usage and memory consumption.

Solution

Upgrade to 20.10.5+ to increase the startup time limit to 300 seconds.

If this is insufficient, it means that the server is attempting to execute something, and has a deadlock. This is usually the case when the EnableMigrations parameter is set to True, and there is a large migration hanging the main thread.

If the flag is set to False, collect a memory dump, and submit it to your customer representative.